Improvement in steam-cylinders with steam-jackets



E. D. LEAVITT, J1-., & W. JONES. Steam Cylinder with Steam Jacket.

No. 201,429. Patented March 19,1878.

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UNITED STATES PATENT OEEIcE.

ERASMUS D. LEAVITT, JR, OF CAMBRIDGE, MASSACHUSETTS, AND WASH- IN GTON JONES, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-CYLINDERS WITH STEAM-JACKETS.

Specification forming part of Letters Patent No. 201,429, dated March 19, 1878; application filed January 15, 1878.

tending entirely around the cylinder which contains the bore in which the piston works,

- and in which the steam is admitted to heat the cylinder,) the making of the cylinder proper and the jacket in one continuous casting, as is usually done, renders the casting, which is of considerable size and weight, and somewhat complicated, liable to be broken across the interior part, or cylinder proper, by the unequal shrinking of the metal in cooling, which frequently spoils the cylinder after it has left the hands of the mechanist by its unequal expansion and shrinkage in use.

This invention is for the purpose of obviating this difficulty; and it consists in making the outer wall of the jacket discontinuous, leaving an annular space entirely around the circumference, and joining the two parts of the jacket by a solid expansion-joint, socalled, which makes an impervious inclosnre of the steam-space of the jacket, and by its slight elasticity prevents the possibility of establishing any undue strain of the parts by the heating or shrinking of the metal.

The drawing represents a steam-cylinder made with a jacket cast on it and an expansion-joint attached to it.

A is the outer wall of the jacket, andB the wall of the cylinder-bore. O is the expansionjoint, which connects the two parts of the jacket, and thus makes the entire wall of the jacket in effect continuous, while, by its slight flexibility on yielding capacity, it prevents the existence of undue strain in the wall of the cylinder proper or of the jacket by shrinkage.

When the cylinder is cast an annular space, D, is left open entirely around the cylinder, which entirely relieves thecylinder proper or the jacket of any lengthwise strain in cooling, l

and on either side of this space a belt is formed upon the jacket, upon which the expansionjoint G is fitted .by boring and turning with a steam-tight joint, and is further secured thereto by bolting it to the belts, as shown.

This expansion-joint is, by preference, made of copper, or some metal that will not break by the slight flexure to which it is subjected.

We do not claim casting the steam-cylinder with its jacket in one piece, nor the use of an expansion-j oint, so-cal1ed,to avoid the effect of expansion by heat of two separate parts so connected, as they are both old and well-known devices.

We claim The combination of an expansion-joint with the steam-jacket when the jacket and cylin- 

